A landmark ICSID arbitration ruling shows how state environmental decisions can expose governments to liability — and leave investors with far less than they sought.

In July 2024, an international arbitration tribunal issued a decision that sent a clear signal to governments and corporations alike: environmental protection and foreign investment can collide in costly and unpredictable ways. The case — Eco Oro Minerals Corp. v. Republic of Colombia — is a cautionary tale about the financial and legal consequences that arise when environmental regulations affect business operations, even when those regulations serve a legitimate public purpose.

The Background: Gold, Water, and a Fragile Ecosystem

Eco Oro Minerals Corp., a Canadian mining company, held Concession Contract 3452 — rights granted by the Colombian government in 2007 to explore and exploit the Angostura gold and silver deposit in the Santander region. The Angostura Project was a significant investment: the company had spent over USD 250 million developing the site, which held estimated resources of more than 30 million tonnes of ore.

The problem was geography. The Angostura deposit sits in and around the Santurbán Páramo — a high-altitude wetland ecosystem that serves as the primary water source for approximately 2.5 million people. Páramos are among the most ecologically sensitive environments on Earth, and Colombian law progressively moved to protect them from industrial activity. Over a series of legislative and regulatory steps, Colombia established that mining operations could not be conducted within páramo boundaries.

As the páramo delimitation process advanced, it became increasingly uncertain — and ultimately impossible — for Eco Oro to obtain the environmental licence it needed to begin exploitation. Without that licence, the concession was commercially worthless.

The Legal Dispute: A USD 696 Million Claim

Eco Oro turned to international arbitration, filing a claim under the Canada-Colombia Free Trade Agreement (FTA) before the International Centre for Settlement of Investment Disputes (ICSID). The company alleged two principal breaches by Colombia.

First, Eco Oro argued that Colombia had effectively expropriated its investment by destroying the commercial value of the Angostura Project through its environmental measures — a form of expropriation known as «indirect» or «creeping» expropriation. Second, the company contended that Colombia had failed to provide Eco Oro’s investment with the minimum standard of treatment required under the FTA, by acting in an arbitrary and inconsistent manner throughout the regulatory process.

The company sought USD 696 million in compensation — the estimated fair market value of the Angostura Project based on comparable mining transactions. It was a sum that reflected not just sunk costs, but the potential future value of a major gold and silver operation.

The Tribunal’s Ruling: Right Violated, No Damages Awarded

In its 2021 Decision on Jurisdiction and Liability, the Tribunal reached a split verdict. The majority dismissed the expropriation claim, concluding that Colombia’s environmental measures were legitimate exercises of state regulatory authority — the so-called «police powers» doctrine, which holds that governments may regulate in the public interest without compensating investors, even where those regulations diminish the value of their investments.

However, the Tribunal did find that Colombia had breached its obligation to provide the minimum standard of treatment under Article 805 of the FTA. The government had acted in a way that was arbitrary, inconsistent, and unfair to Eco Oro during the regulatory process — failing to provide clear guidance and subjecting the investor to an uncertain regulatory environment.

Despite finding a treaty violation, the Tribunal’s 2024 Award on Damages reached a striking conclusion: Eco Oro was entitled to zero compensation. The reason was a fundamental problem of proof. The company had failed to demonstrate, with sufficient certainty, that the breach — the loss of the right to apply for an environmental licence — had actually caused a quantifiable financial loss. The Tribunal found that even if Eco Oro had been treated fairly throughout the process, the probability of it ever obtaining an environmental licence to mine within or near the páramo was too uncertain to underpin a damages award.

Why This Matters for Business

The Eco Oro case illustrates several critical business risks that arise at the intersection of environmental policy and investment.

Regulatory risk is real and escalating. Environmental regulations are not static. Governments around the world are strengthening protections for ecosystems, water sources, and biodiversity. Businesses operating in or near ecologically sensitive areas face the genuine possibility that the legal framework governing their operations will shift — sometimes dramatically — over the life of a project.

International treaties provide a floor, not a guarantee. Free trade agreements and bilateral investment treaties give investors legal rights and access to international arbitration. But as this case demonstrates, winning on liability does not automatically mean winning damages. The burden of proving a causal link between government misconduct and actual financial loss can be extremely difficult to satisfy — especially when environmental uncertainty already clouded the investment’s prospects.

Due diligence must account for environmental exposure. The Tribunal expressly noted concerns about whether Eco Oro had conducted sufficient due diligence before committing hundreds of millions of dollars to underground mine development. Businesses entering environmentally sensitive sectors or geographies must rigorously assess not only the commercial opportunity, but the long-term regulatory trajectory — including the possibility that environmental standards will tighten over time.

States face legal exposure when they act inconsistently. Colombia’s environmental goals were upheld by the Tribunal — but the government was still found to have breached its treaty obligations by treating the investor unfairly during the regulatory process. For governments, this underscores the importance of transparency, consistency, and procedural fairness when implementing environmental policy that affects existing investments.

The Broader Trend

Eco Oro v. Colombia is not an isolated incident. Across the globe, investment disputes increasingly involve environmental regulation: mining operations blocked by biodiversity protections, energy projects halted by climate policy, and infrastructure developments stopped by water or land-use concerns. The question of how to balance legitimate state environmental action with investor protection has become one of the defining tensions of international economic law.

For businesses, the lesson is not that environmental regulation is the enemy of investment. Rather, it is that environmental risk — like political risk, currency risk, or market risk — must be identified, assessed, and managed from the earliest stages of any project. Companies that treat environmental compliance and stakeholder engagement as peripheral concerns do so at significant financial peril.

The Santurbán Páramo provides water for millions of people. The Angostura Project held the promise of hundreds of millions in mineral wealth. The outcome of this decade-long dispute — one party with a violated right but no compensation, the other facing legal costs but no damages bill — suggests that neither side truly won. In an era of accelerating environmental change, finding frameworks that can accommodate both ecological protection and business certainty will be one of the defining challenges of the coming decades.

Source: ICSID Case No. ARB/16/41 — Eco Oro Minerals Corp. v. Republic of Colombia, Award on Damages (15 July 2024).